ive started using a mic to mic my cab, im playing through a 212 rectifier and mini rec amp, into a m-audio profire610, using logic and a sm57. my sound doesnt seem good to me, ive recorded different tracks 2 dozen times to experiment. whats the best place for the mic?
You need to experiment with mic placement. Having said that the sweet spot is usually a little off centre on one of the speakers with the mic pointed towards the cone but with the mic held at an angle rather than straight at it. Also, you should try getting the cab off the flooror angled/tilted back. Forinstance, try putting it on a chair with a rug or something under the chair as this can help with bass issues and reflection.
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and should my output levels not be clipping at all, or does it matter. i have been making the backing track not clip and my recorded guitar not clip, and tried both not clipping the output and clipping the output to make the levels match the volume of music in my library cause sometimes my recorded levels seem low if i dont boost the output.
any recording advice?
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You should try not to clip at recording. Digital clipping isn't nice and is extremely difficult to remove/mask late. Volume is set at mastering, for recording and mixing you need to set your levels quite conservatively so that you have a good, clean signal. For recording the issue is a strong signal that makes good use of the SNR. Set your input to the recording device so that it never clips. Find the point where it clips on the loudest guitar strum and then back the input off some way so that when you play that bit again the meter stays away from clipping. In digital 24bit the noise floor is down at around -144dB. That means you have more than enough range without ever needing to approach 0dBFS. So set your signal in Logic so that it appears around -12dB peak for an individual track. The 2bus main should never exceed -3dB and preferably should stay at around -6dB peak level. If you want to know more you can check out digital gainstaging.
Us mastering engineers sometimes deliberately clip to get level but we do so knowing how our hardware responds. I know that I can drive our Orpheus in to the red quite some way wthout things getting nasty. My rig however is properly gainstaged and balanced. However, I think your m-audio needs to stay away from its clip level.